A neutral contact structure for a circuit breaker

Abstract

The application discloses a neutral pole contact structure of a circuit breaker, which comprises a shell structure, a static contact, a dynamic contact, a driving component and a biasing component. The dynamic contact is provided with a driving groove. The driving component is provided with a driving part. The driving part and the biasing component are in transmission cooperation at the driving groove, so that the transmission of the resultant force between the driving component and the dynamic contact is realized. The thrust received by the driving component when the driving component is closed can be converted into the biasing force applied by the biasing component to the dynamic contact. The direction of the biasing force is consistent with the closing force direction of the dynamic contact. The dynamic contact is rapidly closed under the action of the resultant force, the stress is stable and uniform, the dynamic contact and the static contact are more stably connected, the problem of poor contact of the circuit breaker is avoided, and the contact structure is simple in structure, convenient to install, time-saving and labor-saving in production and assembly, and is favorable for mass production of the product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit breaker, in particular to a neutral pole contact structure of circuit breaker. BACKGROUND

[0002] The leakage circuit breaker with openable neutral line is widely used in household or similar places, such as home, office building, etc. Since the neutral line is openable, the leakage circuit breaker disconnects the phase line circuit and the neutral line circuit when leakage protection and overload protection, and completely disconnects the main circuit, ensuring the safety of personnel and electrical equipment.

[0003] Chinese patent document CN1723596B discloses an operating unit of leakage circuit breaker, which comprises a shell with a phase line pole chamber and a neutral line pole chamber, and a phase line pole operating mechanism and a neutral line pole operating mechanism arranged in the phase line pole chamber and the neutral line pole chamber respectively. The neutral line pole operating mechanism comprises a driving rod, a moving contact, a moving contact spring and a static contact. One end of the driving rod is coupled with the phase line pole operating mechanism, and the other end is hinged with the moving contact. The moving contact is rotatably connected with the side wall of the neutral line pole chamber through a moving contact positioning shaft. A guide groove is arranged on the inner side wall of the neutral line pole chamber. One end of the driving rod connected with the moving contact moves along the guide groove. An irregular positioning hole with a size larger than the moving contact positioning shaft is arranged on the moving contact. The moving contact positioning shaft is arranged in the irregular positioning hole. One end of the moving contact spring is connected with the inner side wall of the neutral line pole chamber through a spring positioning shaft, and the other end is hung in the irregular positioning hole.

[0004] However, the operating unit of the leakage circuit breaker has the following problems in actual use:

[0005] 1. When the driving rod drives the moving contact to engage with the static contact, the moving contact spring will exert a counterforce on the moving contact when it is stretched by the moving contact. The counterforce and the pushing force exerted by the driving rod will drive the moving contact and the static contact to engage. Since the directions of the counterforce and the pushing force are different, the moving contact is unevenly stressed in the engagement process, which easily causes unstable contact between the moving contact and the static contact. Moreover, one end of the moving contact spring is hook-shaped and hung in the irregular positioning hole, which is inconvenient to install. In the hanging process, the hook part of the moving contact spring is prone to deformation, which needs to be reinstalled, wasting time and effort. SUMMARY

[0006] Therefore, the technical problem to be solved by the present application is to overcome the problem that the moving contact of the neutral line pole operating mechanism in the prior art is stressed at multiple points, causing uneven stress on the moving contact and the static contact and unstable contact, so as to provide a neutral pole contact structure of circuit breaker, in which the moving contact and the static contact are evenly stressed and stably contacted.

[0007] The application provides a neutral pole contact structure of a circuit breaker, which is driven by an operating mechanism of the circuit breaker to perform opening or closing operation, comprising:

[0008] A housing structure, in which a static contact and a movable contact rotatable relative to the static contact are arranged, and the movable contact is provided with a driving groove;

[0009] A driving component connected to the operating mechanism and the movable contact, which has a driving part slidingly connected in the driving groove, and when the operating mechanism is closed or opened, the driving part of the driving component is driven to reciprocate in the driving groove, so that when the driving part moves along the driving groove, the movable contact is driven to rotate to a closing position close to the static contact or an opening position away from the static contact;

[0010] A biasing component connected to the driving component and the movable contact, which comprises a first end and a second end arranged at an angle and elastically deformed under pressure, the first end extends to the port of the driving groove and abuts against the driving part, and the second end abuts against the side wall of the movable contact away from the static contact;

[0011] When the driving part moves from the opening position to the closing position, the first end is extruded and deformed, so that the second end of the biasing component exerts a biasing force on the movable contact to rotate towards the static contact;

[0012] When the driving part moves from the closing position to the opening position, the first end gradually recovers the deformation and exerts a biasing force on the driving part to move towards the opening position.

[0013] In the neutral pole contact structure of the circuit breaker, the movable contact comprises a contact end opposite to the static contact, and a driven end arranged relative to the contact end, and the driving groove is a strip-shaped sliding groove arranged on the driven end.

[0014] In the neutral pole contact structure of the circuit breaker, the opening position and the closing position are respectively the positions of the two ends of the driving groove, and the driving part and the biasing component are respectively connected to the two side surfaces of the movable contact.

[0015] In the neutral pole contact structure of the circuit breaker, the movable contact is rotatably arranged in the housing structure through a rotating shaft, the biasing component is a torsion spring sleeved on the rotating shaft, the first end is one of the torsion spring legs of the torsion spring extending to the port of the driving groove in a straight bar shape, and the driving part abuts against the first end through the driving groove.

[0016] In the neutral pole contact structure of the circuit breaker, the side of the movable contact opposite to the stationary contact is provided with a positioning boss, and the second end of the torsion spring is in the form of a hook-shaped clamping on the other side wall of the positioning boss.

[0017] In the neutral pole contact structure of the circuit breaker, the driving component is a connecting rod structure connected between the operating mechanism and the movable contact, and the driving part is an L-shaped bent end arranged at one end of the connecting rod structure.

[0018] In the neutral pole contact structure of the circuit breaker, the shell is provided with a connecting hole corresponding to the operating mechanism, and the other end of the driving component is connected with the operating mechanism in transmission through the connecting hole.

[0019] In the neutral pole contact structure of the circuit breaker, the shell structure is provided with a limiting block on the movement path of the driving component, which is abutted by the limiting block during the opening movement of the driving component driven by the operating mechanism, and is separated from the limiting block during the closing movement of the driving component driven by the operating mechanism.

[0020] In the neutral pole contact structure of the circuit breaker, the shell structure further comprises a mounting groove for positioning the stationary contact and a limiting baffle for shielding the movable contact and the stationary contact, and the limiting baffle is provided with a limiting block which can be inserted into the mounting groove to abut against the stationary contact.

[0021] In the neutral pole contact structure of the circuit breaker, the limiting baffle is further provided with a positioning hole suitable for the rotation shaft to pass through.

[0022] The technical scheme of the present application has the following advantages compared with the prior art:

[0023] 1. The neutral pole contact structure of the circuit breaker provided by the present application, when the operating mechanism drives the moving contact to close operation through the driving part, the driving part extrudes the first end of the biasing member when moving along the driving slot from the open position to the closed position, so that the biasing member applies a biasing force to the moving contact through the second end to rotate the moving contact close to the static contact, realizing the rapid connection of the moving contact and the static contact, and the moving contact will continue to be affected by the biasing force from the second end after closing, thereby increasing the contact pressure between the moving contact and the static contact; and when the operating mechanism drives the moving contact to open operation through the driving part, the driving part gradually releases the first end when moving along the driving slot from the closed position to the open position, at this time the biasing member recovers the deformation and pushes the driving part to move to the open position quickly through the first end, thereby speeding up the opening speed of the moving contact and the static contact, and the advantage of this design is that the transmission of the combined force between the driving part and the moving contact is realized through the transmission cooperation of the driving part and the biasing member at the driving slot, the pushing force received by the driving part when closing can be converted into the biasing force applied by the biasing member to the moving contact, the direction of the biasing force is consistent with the direction of the closing force of the moving contact, and the moving contact is quickly closed under the action of the combined force, the stress is stable and uniform, the connection of the moving contact and the static contact is more stable, thereby avoiding the poor contact problem of the circuit breaker, and the contact structure is simple in structure, convenient to install, time-saving and labor-saving in production and assembly, and conducive to mass production of products.

[0024] 2. The neutral pole contact structure of the circuit breaker provided by the present application, the driving slot is a strip-shaped sliding slot arranged on the driven end, and the open position and the closed position are respectively the two end positions of the driving slot, that is, when the driving part moves to the open position, the driving part pulls the moving contact to open and rotate, so that the contact end rotates away from the static contact, the moving contact is separated from the static contact, and when the driving part moves to the closed position, the driving part pushes the moving contact to close and rotate, so that the contact end rotates close to the static contact, and the moving contact is connected with the static contact.

[0025] 3. The neutral pole contact structure of the circuit breaker provided by the present application, since the biasing member is a torsion spring sleeved on the rotating shaft, the first end and the second end are two torsion spring legs of the torsion spring, that is, the first end extends to the port of the driving slot in a straight bar shape and abuts against the driving part, and the second end is clamped on the side wall of the positioning boss in a hook shape, the positioning boss is arranged to quickly position and install the second end, the second end does not displace when abutting against the positioning boss during the deformation of the biasing member, so that the biasing force applied by the second end to the moving contact can reliably act on the contact end, thereby increasing the contact pressure between the moving contact and the static contact, ensuring that the moving contact closely abuts on the static contact, avoiding the poor contact problem, and improving the stability of the product in use.

[0026] 4. The neutral pole contact structure of the circuit breaker provided by the present application, the driving component is a connecting rod structure, the driving part is an L-shaped bent end arranged at one end of the connecting rod structure, the housing is provided with a connecting hole corresponding to the operating mechanism, when the driving component is installed, only the L-shaped bent end is passed through the driving groove and abuts against the first end of the biasing member, and the other end of the driving component is passed through the connecting hole and connected with the operating mechanism in transmission, so that the installation of the driving component can be completed, and the structure is simple and the installation is convenient.

[0027] 5. The neutral pole contact structure of the circuit breaker provided by the present application, the driving component is a connecting rod structure, the driving part is an L-shaped bent end arranged at one end of the connecting rod structure, the housing is provided with a connecting hole corresponding to the operating mechanism, when the driving component is installed, only the L-shaped bent end is passed through the driving groove and abuts against the first end of the biasing member, and the other end of the driving component is passed through the connecting hole and connected with the operating mechanism in transmission, so that the installation of the driving component can be completed, and the structure is simple and the installation is convenient.

[0028] 6. The neutral pole contact structure of the circuit breaker provided by the present application, the driving component is a connecting rod structure, the driving part is an L-shaped bent end arranged at one end of the connecting rod structure, the housing is provided with a connecting hole corresponding to the operating mechanism, when the driving component is installed, only the L-shaped bent end is passed through the driving groove and abuts against the first end of the biasing member, and the other end of the driving component is passed through the connecting hole and connected with the operating mechanism in transmission, so that the installation of the driving component can be completed, and the structure is simple and the installation is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0030] Figure 1 It is a structural schematic diagram of the circuit breaker provided by the present application;

[0031] Figure 2 It is an explosion view of the neutral pole contact structure of the circuit breaker provided by the present application;

[0032] Figure 3 It is a structural schematic diagram of the neutral pole contact structure of the present application when the circuit breaker is opened;

[0033] Figure 4 It is a structural schematic diagram of the neutral pole contact structure of the present application when the circuit breaker is closed;

[0034] Figure 5 It is a structural schematic diagram of the neutral pole contact structure of the present application when the circuit breaker is opened;Figure 2 Structure diagram of the movable contact shown;

[0035] Figure 6 For Figure 2 Structure diagram of the limiting baffle shown;

[0036] Explanation of reference signs:

[0037] 1 - housing structure; 11 - rotating shaft; 12 - connecting hole; 13 - limiting protrusion; 14 - mounting groove; 15 - limiting baffle; 16 - limiting clamping block; 17 - positioning hole;

[0038] 2 - stationary contact;

[0039] 3 - movable contact; 31 - driving groove; 32 - contact end; 33 - driven end; 34 - positioning boss;

[0040] 4 - driving component; 41 - driving part; 42 - closing position; 43 - opening position;

[0041] 5 - biasing member; 51 - first end; 52 - second end. DETAILED DESCRIPTION

[0042] The technical solutions of the present application will be described below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of the present application.

[0043] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In addition, the technical features involved in the different embodiments of the application described below can be combined with each other as long as they do not conflict with each other.

[0046] Embodiment 1

[0047] The present embodiment will be described in detail below with reference to the accompanying drawings:

[0048] The present application provides a neutral pole contact structure of a circuit breaker as shown in Figures 1-6 which is driven by an operating mechanism of the circuit breaker to perform opening or closing operation, comprising:

[0049] a housing structure 1, in which a static contact 2 and a movable contact 3 rotatable relative to the static contact 2 are arranged, and the movable contact 3 is provided with a driving groove 31;

[0050] a driving component 4 connected to the operating mechanism and the movable contact 3, which has a driving part 41 slidingly connected in the driving groove 31, and when the operating mechanism is closing or opening, the driving part 41 of the driving component 4 is driven to reciprocate in the driving groove 31, so that when the driving part 41 moves along the driving groove 31, it has a closing position 42 driving the movable contact 3 to rotate close to the static contact 2, and an opening position 43 driving the movable contact 3 to rotate away from the static contact 2;

[0051] a biasing component 5 connected to the driving component 4 and the movable contact 3, which comprises a first end 51 and a second end 52 arranged at an angle and elastically deformed under pressure, the first end 51 extends to the port of the driving groove 31 and abuts against the driving part 41, and the second end 52 extends to abut against the side wall of the movable contact 3 facing away from the static contact 2;

[0052] When the driving part 41 moves from the opening position 43 to the closing position 42, the first end 51 is extruded and deformed, forcing the second end 52 of the biasing component 5 to exert a biasing force on the movable contact 3 to rotate towards the static contact 2;

[0053] When the driving part 41 moves from the closing position 42 to the opening position 43, the first end 51 gradually recovers the deformation and exerts a biasing force on the driving part 41 to move towards the opening position 43.

[0054] The above embodiment is the core technical scheme of the present embodiment, when the operating mechanism drives the movable contact 3 to close through the driving part 4, the driving part 41 extrudes the first end 51 of the biasing part 5 when moving from the open position 43 to the closed position 42 along the driving groove 31, so that the biasing part 5 applies a biasing force to the movable contact 3 to rotate towards the static contact 2 in a state of being pressed and deformed, thereby realizing the rapid connection of the movable contact 3 and the static contact 2, and the movable contact 3 will continue to be affected by the biasing force from the second end 52 after closing, thereby increasing the contact pressure between the movable contact 3 and the static contact 2; and when the operating mechanism drives the movable contact 3 to open through the driving part 4, the driving part 41 gradually releases the first end 51 when moving from the closed position 42 to the open position 43 along the driving groove 31, at this time the biasing part 5 recovers the deformation and pushes the driving part 41 to move to the open position 43 quickly through the first end 51, thereby speeding up the opening speed of the movable contact 3 and the static contact 2, and the advantage of this design is that the transmission of the combined force between the driving part 4 and the movable contact 3 is realized through the transmission cooperation of the driving part 41 and the biasing part 5 at the driving groove 31, the pushing force received by the driving part 4 when closing can be converted into the biasing force applied by the biasing part 5 to the movable contact 3, the direction of the biasing force is consistent with the closing force direction of the movable contact 3, the rapid closing of the movable contact 3 is realized under the action of the combined force, the stress is stable and uniform, the connection of the movable contact 3 and the static contact 2 is more stable, thereby avoiding the problem of poor contact of the circuit breaker, and the contact structure is simple in structure, easy to install, saves time and labor in production and assembly, and is conducive to mass production of products.

[0055] As a specific structural arrangement, the movable contact 3 comprises a contact end 32 opposite to the static contact 2, and a driven end 33 arranged opposite to the contact end 32, and the driving groove 31 is a strip-shaped sliding groove arranged on the driven end 33, which ensures that the driving part 41 pushes the driven end 33 to rotate and drives the movable contact 3 to rotate when the driving part 4 performs the opening and closing operation through the sliding of the driving part 41 and the driving groove 31, so that the contact end 32 is connected with and separated from the static contact 2, and the open position 43 and the closed position 42 are respectively arranged at two ends of the driving groove 31, as shown in Figure 3 When the driving part 41 moves to the open position 43, it pulls the movable contact 3 to rotate to open, so that the contact end 32 rotates away from the static contact 2, and the movable contact 3 is separated from the static contact 2, and as shown in Figure 4 When the driving part 41 moves to the closed position 42, it pushes the movable contact 3 to rotate to close, so that the contact end 32 rotates towards the static contact 2, and the movable contact 3 is connected with the static contact 2.

[0056] As shown in Figures 2-5As shown, the moving contact 3 is rotatably arranged in the shell structure 1 through the rotating shaft 11, the biasing member 5 is a torsion spring sleeved on the rotating shaft 11, and the shell structure 1 is provided with a rotating shaft mounting hole corresponding to the rotating shaft 11. In assembly, the rotating shaft 11 is first inserted into the rotating shaft mounting hole, and then the moving contact 3 and the biasing member 5 are sleeved on the rotating shaft 11 in sequence, so that the assembly is completed. Further, the side of the moving contact 3 opposite to the stationary contact 2 is provided with a positioning boss 34, and the first end 51 and the second end 52 are two torsion spring legs of the torsion spring, that is, the first end 51 extends to the port of the driving groove 31 in a straight bar shape and abuts against the driving portion 41, and the second end 52 is in the form of a hook and is clamped on the side wall of the positioning boss 34. The positioning boss 34 plays a role of quick positioning and installation for the second end 52, and the second end 52 does not displace when the biasing member 5 deforms, so that the biasing force exerted by the second end 52 on the moving contact 3 can reliably act on the contact end 32, thereby increasing the contact pressure of the moving contact 3 and the stationary contact 2, ensuring that the moving contact 3 is tightly attached to the stationary contact 2, avoiding poor contact problems, and improving the stability of the product in use.

[0057] The specific structure of the driving component 4 will be described in detail below. Figures 2-3 The specific structure of the driving component 4 will be described in detail below.

[0058] The driving component 4 is a connecting rod structure connected between the operating mechanism and the moving contact 3. The driving portion 41 is an L-shaped bent end arranged at one end of the connecting rod structure. Since the driving portion 41 and the biasing member 5 are connected to the two side surfaces of the moving contact 3, respectively, when the driving component 4 is installed, only the L-shaped bent end needs to be inserted through the driving groove 31 and abut against the first end 51 of the biasing member 5, and the other end of the driving component 4 passes through the connecting hole 12 and is connected in transmission with the operating mechanism, so that the installation of the driving component 4 is completed. The structure is simple and convenient to install, and when the operating mechanism is opened and closed, the connecting hole 12 drives the driving component 4 to slide as a whole, thereby driving the moving contact 3 and the stationary contact 2 to open and close.

[0059] As a specific structure, the shell structure 1 is provided with a limiting protrusion 13 on the movement path of the driving component 4, which abuts against the limiting protrusion 13 during the opening movement of the driving component 4 driven by the operating mechanism, and separates from the limiting protrusion 13 during the closing movement of the driving component 4 driven by the operating mechanism. The limiting protrusion 13 limits the driving component 4, so as to avoid the driving component 4 from rotating too much and colliding with other components in the circuit breaker during the opening movement, and also limits the opening rotating range of the movable contact 3, so as to ensure that the opening and closing distances of the movable contact 3 and the static contact 2 are within the preset range, and improve the safety of the product during use.

[0060] As shown in Figure 2 The shell structure 1 further includes a mounting groove 14 for positioning the static contact 2, and a limiting baffle 15 for shielding the movable contact 3 and the static contact 2. The limiting baffle 15 is provided with a limiting clamping block 16 which can be inserted into the mounting groove 14 and abut against the static contact 2. The limiting clamping block 16 abuts against the static contact 2, so as to ensure that the static contact 2 does not shake after being mounted in the mounting groove 14, and the movable contact 3 is pressed by the limiting baffle 15 and is in the same mounting plane as the static contact 2, so as to avoid the problem of installation misalignment of the movable contact 3 and the static contact 2 after installation, and ensure the reliable engagement of the movable contact 3 and the static contact 2. Further, the limiting baffle 15 is further provided with a positioning hole 17 through which the rotating shaft 11 passes, so as to facilitate the installation and fixation of the limiting baffle 15.

[0061] Obviously, the above embodiments are only examples for clearly illustrating the present application, and are not intended to limit the embodiments. Based on the above description, other different forms of changes or modifications can be made by those skilled in the art. Here, all the embodiments are not required to be exhausted, and the obvious changes or modifications derived therefrom are still within the protection scope of the present application.

Claims

1. A neutral contact structure for a circuit breaker, driven by the operating mechanism of the circuit breaker to perform opening or closing operations, characterized in that... , comprising: A shell structure (1) is provided with a static contact (2) and a movable contact (3) rotatable relative to the static contact (2), and a driving groove (31) is arranged on the movable contact (3); A driving component (4) is connected to the operating mechanism and the movable contact (3), and has a driving part (41) slidingly connected in the driving groove (31). When the operating mechanism is closed or opened, the driving part (41) of the driving component (4) is driven to reciprocate in the driving groove (31), so that when the driving part (41) moves along the driving groove (31), the driving part (41) has a closing position (42) for driving the movable contact (3) to rotate close to the static contact (2), and an opening position (43) for driving the movable contact (3) to rotate away from the static contact (2); A biasing member (5) is connected to the driving component (4) and the movable contact (3), and includes a first end (51) and a second end (52) arranged at an angle and elastically deformed under pressure. The first end (51) extends to the port of the driving groove (31) and abuts against the driving part (41). The second end (52) extends to abut against the side wall of the movable contact (3) away from the static contact (2); When the driving part (41) moves from the opening position (43) to the closing position (42), the first end (51) is extruded and deformed, forcing the second end (52) of the biasing member (5) to exert a biasing force on the movable contact (3) to rotate towards the static contact (2); When the driving part (41) moves from the closing position (42) to the opening position (43), the first end (51) gradually recovers the deformation and exerts a biasing force on the driving part (41) to move towards the opening position (43); The movable contact (3) is rotatably arranged in the shell structure (1) through a rotating shaft (11). The biasing member (5) is a torsion spring that is sleeved on the rotating shaft (11). The first end (51) is one of the torsion spring legs that extends to the port of the driving groove (31) in a straight bar shape. The driving part (41) abuts against the first end (51) through the driving groove (31); The movable contact (3) includes a contact end (32) opposite to the static contact (2) and a driven end (33) arranged relative to the contact end (32). The driving groove (31) is a strip-shaped sliding groove arranged on the driven end (33). The side of the movable contact (3) away from the static contact (2) is provided with a positioning boss (34). The second end (52) is the other torsion spring leg of the torsion spring that is hooked and abuts against the side wall of one side of the positioning boss (34); The shell structure (1) is provided with a connecting hole (12) corresponding to the operating mechanism. The other end of the driving component (4) passes through the connecting hole (12) and is connected to the operating mechanism in transmission.

2. The neutral pole contact structure of a circuit breaker according to claim 1, characterized in that The opening position (43) and the closing position (42) are respectively the two end positions of the driving slot (31), and the driving part (41) and the biasing member (5) are respectively connected to the two side surfaces of the movable contact (3).

3. The neutral pole contact structure of a circuit breaker according to claim 1, characterized by The driving member (4) is a connecting rod structure which is in transmission connection between the operating mechanism and the movable contact (3), and the driving part (41) is an L-shaped bent end which is arranged at one end of the connecting rod structure.

4. The neutral pole contact structure of a circuit breaker according to claim 1, characterized by The shell structure (1) is provided with a limiting block (13) which is located on the movement path of the driving member (4) and is in abutment with the limiting block (13) during the opening movement of the driving member (4) driven by the operating mechanism, and is separated from the limiting block (13) during the closing movement of the driving member (4) driven by the operating mechanism.

5. The neutral pole contact structure of the circuit breaker according to any one of claims 1 to 4, characterized in that The shell structure (1) further comprises a mounting slot (14) for positioning the static contact (2) and a limiting baffle (15) for shielding the movable contact (3) and the static contact (2), and the limiting baffle (15) is provided with a limiting clamping block (16) which can be inserted into the mounting slot (14) to abut against the static contact (2).

6. The neutral pole contact structure of a circuit breaker according to claim 5, characterized in that The limiting baffle (15) is further provided with a positioning hole (17) which is suitable for the rotation shaft (11) to pass through.

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